10-Q
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<span id="c06270exv32w1.htm"></span><html lang="en-US"> <HEAD> <title>Form 10-Q filed by on 2010-10-28</title> </HEAD> <BODY bgcolor="#FFFFFF"> <!-- PAGEBREAK --> <DIV style="font-family: 'Times New Roman',Times,serif; margin-left: .25in; width: 7.50in"> <P align="right" style="font-size: 10pt"><B>Exhibit 32.1</B> <P align="center" style="font-size: 10pt"><B>CERTIFICATION<BR> OF<BR> CHIEF EXECUTIVE OFFICER<BR> AND<BR> CHIEF FINANCIAL OFFICER<BR> PURSUANT TO 18 U.S.C. 1350,<BR> AS ADOPTED PURSUANT TO<BR> SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002</B> <P align="left" style="font-size: 10pt; text-indent: 4%">I, Donald E. Brandt, certify, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section&nbsp;906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report on Form&nbsp;10-Q of Pinnacle West Capital Corporation for the fiscal quarter ended September&nbsp;30, 2010 fully complies with the requirements of Section&nbsp;13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Quarterly Report on Form&nbsp;10-Q fairly presents, in all material respects, the financial condition and results of operations of Pinnacle West Capital Corporation. <P align="left" style="font-size: 10pt">Date: October&nbsp;28, 2010. <P align="left" style="margin-left:45%; font-size: 10pt"><U>/s/ Donald E. Brandt</U><BR> Donald E. Brandt<BR> Chairman, President and<BR> Chief Executive Officer<BR> <P align="left" style="font-size: 10pt; text-indent: 4%">I, James R. Hatfield, certify, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section&nbsp;906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report on Form&nbsp;10-Q of Pinnacle West Capital Corporation for the fiscal quarter ended September&nbsp;30, 2010 fully complies with the requirements of Section&nbsp;13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Quarterly Report on Form&nbsp;10-Q fairly presents, in all material respects, the financial condition and results of operations of Pinnacle West Capital Corporation. <P align="left" style="font-size: 10pt">Date: October&nbsp;28, 2010. <P align="left" style="margin-left:45%; font-size: 10pt"><U>/s/ James R. Hatfield</U><BR> James R. Hatfield<BR> Senior Vice President and<BR> Chief Financial Officer<BR> <P align="center" style="font-size: 10pt">&nbsp; <P align="center" style="font-size: 10pt; display: none"> </DIV> </BODY> </HTML>